Alta Service Bulletin re: Motion booting re: firmware 4.0.4 and earlier

Discussion in 'Announcements' started by Andy Johnson-Laird, Jan 26, 2017.

  1. Andy Johnson-Laird

    Andy Johnson-Laird Administrator
    Staff Member

    Jul 31, 2012
    Likes Received:
    JANUARY 26, 2017

    AD17 Motion Booting in Firmware 4.0.4 and previous

    Date Released: 25-January-2017
    Subject: Motion Booting ALTA using Firmware 4.0.4 and previous
    Effectivity: All ALTA 6 and ALTA 8
    Require Action: Required


    This Airworthiness Directive (AD) is being issued to alert all ALTA users of a bug associated with the Motion Booting function that could prevent the machine from booting and operating successfully. Use of the Motion Booting function is not recommended for firmware versions 4.0.4 and previous. No other functions are known to be impacted by this bug.

    This AD is being issued to all ALTA 6 and ALTA 8 owners.


    ALTA flight control firmware includes an optional function to allow the machine to be booted on a moving platform such as on a boat. This boot process is “off” by default in the ALTA App and must be selectively turned “on” to be used.


    A bug was discovered that affects the stored gyroscope data on the Synapse flight controller. During the Motion Booting startup sequence, the ALTA could pull old or incorrect gyroscope data or may revert to estimated values rather than the stored values. As a result, the machine may exhibit out of control behavior if booted with Motion Booting on.

    The standard booting process is not affected by this bug.


    Do not use the Motion Booting function available in the ALTA App v1.6 (Synapse firmware version 4.0.4) until a new firmware version has been released for public use.

    For questions regarding this Service Bulletin, please contact Freefly Support.

    Freefly Customer Support
    Phone: +1 (425) 485-5500
    Hours of Operation: M-F 8am-6pm PST

    Best Regards,

    Freefly ALTA Team


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